Jack for heel-nailing machines



(No Model) S. A. KR.EWSON.

JAGK POR 'HEEL NAILING MACHINES.

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/Cv-fv WITNESEES- ypost and a portion of the machine.

UNITED STATES PATENT OFFICE.,

SAMUEL A. KREVVSON,` 'OF PENSAUKEN, NEW JERSEY.

JACK FOR HEEL-NAILING MACHINES.

SPECIFICATION forming part ef Lettere Patent No. 514,852, aerea February 13, 1894. Application filed February 25, 1892. Serial No. 422,732. l (No model.)

To a/Z whom, t may concern:

Be it known that I, SAMUEL A. KREWSON, a citizen of the United States, residing at Pensauken, in the county of Camden and Statel of New Jersey, have invented a new and useful Improvement in Jacks for Heel-Nailing Machines, of which the'following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification and explaining its nature. y

The invention is an improvement upon the jack known as the National jack and forming a part of the National heel nailing machine. Its principal object is, to provide a greater range of adjustment to the side centering guides or fingers.

A Referring lto the drawings, Figure l is a View infront elevation of the jack, one of the side guides, fingers or holders being broken out. Fig. 2 is a view, in si'de elevation thereof, also showing the last, last spindle, spindle Fig. 3 is a detailed view, enlarged, of one of the side fingers or holders and its connections in full lines and in dotted outline to illustrate some of its movements. Fig. 4 is a similar view to show other movements ofthe holders.

Referring to the drawings, A is the bed of the machine.

A is a portion of the back post to which the jackV is attached.l Y

B is the last, b the spindle which supports it and b the post in whichy the spindle is vertically adjustable.

C is the back stop. It is like that of the National machine and is horizontally adjustable in its holder c,'which, in turn is vertically yielding upon the back plate c.

D D are the shoe guides or holders. Each is supported in the upper end of a lever or pivoted holder d, each holder being pivoted respectively to an outwardly extending section d of the arm d2 at d5. The holders are made ot iron or other suitable metal and have the inward extending curved flanges d4 and the outward extending curved bearing sections 615. The iiange or lip d4 enters the crease between'the sole and upper and counter, and the section d5 bears against the upper at the counter. Each holder D also has its outer or rear end d6 formed to slide in a slideway inner end of the holder in the same normal relation to the lever d at all times excepting when brought into contact with the shoe, when, if there is any difference between the thickness of the shoe upon one side of the last as compared with that upon the other, the finger or holder upon the thicker side yields horizontally in relation to the lever d. The levers el are free to be tipped inward toward each other by pressure; that is, the only thing to be overcome in so tipping them is the resistance of the springs f, each of which is attached respectively to the horizontal outwardly extending arm f of the lever d and the downwardly extending arm f2 of the arm cl2. The height of the lingers or holders D D is varied-as may be desired by the adjusting screws g, one for each. Each one screws in a threaded hole in the arm section d and bears against the under surface of the lever extension f and serves two purposes; first, to vary the inclination of the lever d and thereby theelevation of the holder; and second, as av back stop to prevent the holders from being drawn or moved upward. The arms d2 are pivoted at 7L at the lower corners of the plate c', and they are connected with each other by a right and left threaded screw m carried near the upper end of the plate c by a collar and extending into nuts attached respectively to the arms d2. The rotation of this screw moves the arms d2 and consequently the holders D D unit'ormljT toward and from each other.

In use, the shoe, having been mounted upon' the last, and the arms d2 having been adjusted to bring the holders D D into approximately proper holding relation to the shoe, the last Vis moved into position between them and so that the lianges d4 of the holders which enter the crease between the upper and outer sole at the heel end of the shoe and the holder, while serving to center accurately the shoe upon the last, will at the same time conform themselves automatically to such variations in the work as may appear, not only during the jacking operation but also during the subsequent nailing operation. Among the inequalities may be mentioned those which arise from variations in the thickness of the stock and which call for a horizontal yielding movement of one holder in relation to the other, and also for a vertical movement'oi:` one in relation to the other, as, not only may the heel of the shoe be thicker on one side than on the other, but when it is so it is quite likely to be a little higher along one edge at its juncture with the sole than the other; and during the nailing operation the application of pressure is liable to broaden the sole and upper to some extent, and also to flatten it thereby, again requiring that the guides be conformable automatically to the new conditions; that is, that they have power to separate automatically in relation to each otherunderthestressofpressure,andthatthey yield downward easily and readily tothe pressure without releasing their holding powers, and also that one may yield downward more than the other if desired, or upon dierent planes. The horizontal adjustments are 0btained by connecting the holders with the levers d so that they may have a limited horizontal sliding movement in relation thereto in opposition to springs strong enough to restore them when the strain upon them is released, to their normal position, and also to hold them to their work during their working operation. The independent downward movements are provided by the levers d and springs f, and the downward movement of one is independent of that of the other. These combined movements give each holder a universal conformability or automatic adjustment in relation to the shoe, both while it is being centered and during the nailing operation, which it is very desirable that they should have. Each holder has a lug or stop, n, at its outer end, which limits the extent ot' its inward movement by coming into contact with the edge of the cap plate d?.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States- 1. In a jack for heeling machines, the combination of the arms or levers dhaving a closing and openingmovement in relatio to each other, and provided at their upper ends with slide ways, with the holders D D' respectively, each. having an outward extending shank or section which enters its respective slide way, and is lnovable longitudinally therein, and springs to bear against the said sections of the holders and press them toward each other, in the arms or levers cl, as and for the purposes described.

2. In a jack for heeling machines, the holders D, each having a flange or lip d4, an integral cheek d5, and an outwardly extending slide section d6, and means for moving the tingers toward each other in opposition to a yielding pressure exerted upon them, as and for the purposes described.

3. In a jack for heeling machines, the combination of the levers d, the shoe holders D D', each having the slide section d and stop n and the springs, e, as and for the purposes described.

4. In a jack for heeling machines, the shoe holders D D', horizontally movable in opposition to spring pressure in their levers or supports CZ, and the said levers or supports d pivoted to their holdersor supports, whereby the holders are laterally and vertically movable independently of cach other, as and for the purposes described.

5. In a jack for heeling machines, the combination of the holders D D' constructed to have a sliding movementhorizontally in their levers or supports d, the said levers or supports pivoted to the arms or levers d2, the springs e bearing against the holders D D', and springs for acting upon the levers or holders d to maintain them in contact with their stops, and said stops, substantially as described.

G. In a jack for heeling machines, the combination of the levers (Z2 adjustable toward and from each other, having the armsor sections d', the holder levers d pivoted to said arms or sections, stops for limiting the extent of their outward movements carried by said arms or sections, springs for holding them in 'contact with said stops, slide ways in the upperends of said arms orlevers and shoe holders having slide sections to enter the slide ways in said arms or levers and springs to bear against the said holders, all as and for the purposes described.

7. The combination in a jack for heeling machines, of the holders D D', their pivoted supports d, the springs e, the adjustable stops g and springsf, substantially as described.

SAMUEL A, KREWSON.

In presence of- JOHN MATTHEWS, FRANK L. BALLINGER. 

